Water filter purge indication

ABSTRACT

A refrigeration system includes a water circulation system and a replaceable water filter. The refrigerator includes a sensor that determines if a water filter is present, and a user interface that prompts a user to purge a water filter upon installation of a new water filter in the refrigerator. The water filter may include a memory storage device that stores information concerning the allowable life of the water filter, the remaining life of the water filter, and other information. Information concerning the remaining life of the water filter and other information can be displayed or otherwise communicated to a user by the user interface.

BACKGROUND OF THE INVENTION

Known refrigerators may include a water dispenser and/or an ice maker.The ice maker and water dispenser are typically connected to an externalsource of water, whereby water flows through a water circulation systemin the refrigerator to the ice maker and/or the dispenser.

Such refrigerators may include a water filter to filter the watersupplied to the water dispenser and/or ice maker. Water filters must bereplaced after the service life of the filter has expired. Afterinstallation of a new water filter, air should be purged from the waterfilter to ensure proper operation. Purging involves causing water toflow into and through the water filter, thereby displacing air in thewater filter.

SUMMARY OF THE INVENTION

One aspect of the present disclosure is a refrigerator including aninsulated cabinet forming a refrigerated internal space. Therefrigerator includes a powered refrigeration system providingcontrolled cooling of the refrigerated internal space. The refrigeratoralso includes a water system configured to distribute water from anexternal source to a dispenser. The dispenser may comprise a waterdispenser or an ice maker. The water system includes at least one fluidconduit. A replaceable water filter unit is detachably connected to thefluid conduit whereby water flowing through the conduit is filtered bythe water filter. Upon initial installation of the water filter in therefrigerator, the filter can be purged by causing a predefined amount ofwater to flow through the water filter. The refrigerator also includes acontrol feature that can be actuated by a user to cause water to flowthrough the water filter unit. The refrigerator still further includes auser interface configured to prompt a user to actuate the controlfeature to purge the water filter by causing water to flow through thewater filter upon installation of a water filter. The refrigerator mayinclude a controller and a sensor that is operably connected to thecontroller. The sensor can be utilized by the controller to determine ifa water filter is installed. The controller may be configured to causethe user interface to prompt a user if the controller determines that anew water filter has been installed to thereby signal a user to purgethe water filter.

The water filter may include a memory unit that communicates with thecontroller, wherein the memory unit stores information relating to anamount of water that has passed through the water filter and/or anallowable amount of water that can pass through the water filter unitbefore replacement of the water filter is required. The memory unit maystore the time that the water filter has dispensed water and/or anallowable amount of time the water can be dispensed through the filterbefore replacement of the water filter is required or the time the waterfilter has been installed and/or the amount of time the water filter canbe installed before replacement of the water filter is required.

Another aspect of the present invention is a method of prompting a purgeof a water filter following installation of the water filter in arefrigeration unit of the type having a water circulation system and auser interface. The method includes providing a refrigerator with asensor that is capable of determining if a new water filter has beeninstalled in the refrigerator. The method further includes causing theuser interface to generate a purge signal indicating that the new waterfilter needs to be purged after installation of the new water filter.

These and other features, advantages, and objects of the presentinvention will be further understood and appreciated by those skilled inthe art by reference to the following specification, claims, andappended drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an isometric view of a refrigerator according to one aspect ofthe present invention;

FIG. 2 is a partially fragmentary cross sectional view of a replaceablewater filter and a filter housing that receives the water filter;

FIG. 3 is a partially schematic view of a replaceable water filter and apivotable water filter housing according to another aspect of thepresent invention;

FIG. 4 is a view of the water filter and filter housing of FIG. 3 takenalong the line IV-IV;

FIG. 5 is a partially schematic view of a refrigerator including a waterfilter having a memory unit according to another aspect of the presentinvention; and

FIG. 6 is a cross sectional view of the water filter of FIG. 5 takenalong the line VI-VI.

DETAILED DESCRIPTION

For purposes of description herein, the terms “upper,” “lower,” “right,”“left,” “rear,” “front,” “vertical,” “horizontal,” and derivativesthereof shall relate to the invention as oriented in FIG. 1. However, itis to be understood that the invention may assume various alternativeorientations and step sequences, except where expressly specified to thecontrary. It is also to be understood that the specific devices andprocesses illustrated in the attached drawings, and described in thefollowing specification, are simply exemplary embodiments of theinventive concepts defined in the appended claims. Hence, specificdimensions and other physical characteristics relating to theembodiments disclosed herein are not to be considered as limiting,unless the claims expressly state otherwise.

With reference to FIG. 1, a refrigerator 1 according to one aspect ofthe present disclosure includes an insulated cabinet 2 forming aninterior freezer space 3 and a refrigeration compartment 4 that may beseparated by a partition 5. The refrigeration compartment 4 may beselectively closed off by a door 6, and the freezer space 3 may beselectively closed off by a door 7. A powered refrigeration system 10cools the freezer space 3 and refrigeration compartment 4. The poweredrefrigeration system 10 may comprise a conventional refrigeration systemincluding a compressor, an evaporator, and a condenser. The poweredrefrigeration system 10 may also comprise other known refrigerationsystems. The insulated cabinet 2, freezer space 3, refrigerationcompartment 4, and doors 6 and 7 may be constructed according to knowndesigns, and these features will not therefore be described in detail.

Refrigerator 1 includes a replaceable water filter 15 that is operablyconnected to a water distribution system 16 having a connector 18 thatis configured to supply water to the water distribution system 16 froman external water source 18. The water distribution system may beoperably connected to an ice maker 20 disposed in freezer space 3 orrefrigerator space 4. Ice maker 20 may also be disposed in a cooledhousing/box (not shown) disposed in refrigerator space 4. Ice maker 20may supply ice to an ice dispenser 22 disposed on door 7 in a knownmanner. Similarly, the water distribution system 16 may provide water toa water dispenser 24 disposed on door 7. As discussed in more detailbelow, user inputs such as buttons or levers 68 and 70 may be operablyconnected to a controller 12 (FIG. 2), such that actuation of buttons orlevers 68 and 70 causes controller 12 to distribute ice or water atdispensers 22 and 24, respectively. It will be understood that the icedispenser 22 and water dispenser 24 are optional features, andrefrigerator 1 need not include an ice dispenser 22 or water dispenser24. For example, ice maker 20 may be configured to supply ice to aninternal storage tray (not shown) in a known manner.

Refrigerator 1 may also include a user interface 26. The user interface26 may be disposed on an external surface of one of the doors 6 or 7, oran external surface of cabinet 2. The user interface 26 may also bedisposed within freezer space 3 or refrigeration compartment 4, or othersuitable location as required for a particular application. Userinterface 26 may include a display 28. Display 28 may comprise a screensuch as an LCD or LCD screen, or display 28 may comprise one or morelight sources that can be selectively illuminated to provide informationto a user. User interface 26 may also include one or more user inputfeatures such as push buttons 30. Display 28 may also comprise a touchscreen to provide for user input. Display 28 may comprise one or moreilluminated icons and/or other symbols and/or wording to communicatespecific information to a user. For example, display 28 may include a“purge water filter” message that can be selectively illuminated toprompt a user to purge a water filter 15 after installation of a newwater filter 15. User interface 26 may further comprise an audio devicethat provides a noise signal to alert a user that action (e.g. purgingof a new water filter 15) is required.

With further reference to FIG. 2, water filter 15 may comprise acylindrical body 32 that is received in a cavity 34 formed by a filterhousing 36. The water filter 15 may include a handle 38 that can begrasped by a user during installation and removal of water filter 15. Inthe example illustrated in FIG. 1, the water filter 15 and filterhousing 36 are positioned along a lower portion 40 of front side 42 ofrefrigerator 1. However, it will be understood that water filter 15 maybe positioned at other locations of refrigerator 1 according to therequirements of a particular application.

Referring again to FIG. 2, water filter 15 may include an internalcavity 44 with filter material 46 disposed in the cavity 44 in a knownmanner. Water filter 15 may also include fluid connectors 48 thatdetachably connect to fluid connectors 50 upon installation of waterfilter 15 in filter housing 36 to thereby filter water flowing throughconduits 52 and 54 of water distribution system 16. The fluid connectors48 and 50 may comprise known connectors, and the conduits 52 and 54 maybe configured to supply water to an ice maker 20 and/or water dispenser24 utilizing powered valve 74 and/or pump 72 in a known manner.

Refrigerator 1 includes a sensor such as a rocker switch 56 thatgenerates a signal that can be utilized by a controller 12 to determineif a water filter 15 is disposed in the filter housing 36. Rocker switch56 is mounted in an opening 58 in a sidewall 60 of filter housing 36,and a movable rocker member 62 protrudes into cavity 34 of filterhousing 36, unless a water filter 15 is inserted into the cavity 34. Therocker member 62 is biased to an extended position as shown in FIG. 2.Upon insertion of a water filter 15, an outer surface 64 of water filter15 contacts ramped surface 66 of rocker member 62 thereby moving therocker member 62 inwardly in the direction of the arrow “A.” It will beunderstood that other sensors or the like may be utilized instead ofrocker switch 56 to enable controller 12 to determine if a water filter15 is present in the filter housing 36. Other sensors may be used inplace of rocker switch 56 to provide indication of presence, or lackthereof, of the filter.

In use, a user removes an old water filter 15 by grasping handle 38 andpulling the filter 15 in a direction opposite the arrow “B.” A new waterfilter 15 is then installed by sliding the water filter 15 into thecavity 34 of filter housing 36 in the direction of the arrow “B” untilthe fluid connectors 48 of water filter 15 engage the fluid connectors50 of water distribution system 16. As the water filter 15 is shiftedinto place in filter housing 36, rocker switch 56 is actuated. Thecontroller 12 is configured to determine that the change of state ofrocker switch 56 indicates that a new water filter 15 has been installedin the filter housing 36. As discussed in more detail below inconnection with water filter 15A (FIGS. 5, 6), controller 12 may beconfigured such that a change of state of rocker switch 56 initiatescommunication between controller 12 and a memory unit or device 84.

Upon determining that a new water filter 15 has been installed, thecontroller 12 then causes the user interface 26 to prompt a user topurge the new water filter 15. For example, the user interface 26 mayprovide an illuminated message “purge water filter,” and may alsoprovide an audio signal such as a ringing sound or other suitable noise.When the water filter 15 is initially installed, the internal cavity 44of water filter 15 may be filled with filter material 46 and air.Purging of the water filter 15 requires causing a predefined minimumamount of water to flow through the water filter 15 to purge the airfrom water filter 15. In general, the total amount of water flowingthrough water filter 15 can be determined if the flow rate and time areknown (i.e. the total amount of water is the product of the flow rateand the time interval). Testing can be conducted to determine the flowrate of water through water filter 15 for a specific refrigeratorconfiguration/design. Controller 12 may be configured to cause userinterface 26 to continue signaling that the water filter 15 needs to bepurged (e.g. by actuating button/lever 70 until a required amount ofwater has flowed through water filter 15.

Following installation of a new water filter 15, controller 12 may beconfigured to cause user interface 26 to provide a signal to a userindicating that the water filter needs to be purged until apredetermined amount of water has flowed through the new water filter15. A user can actuate the pump 72 and/or valve 74 by pushing on pad orlever 70 to cause water to be dispensed from water dispenser 24.Alternatively, controller 12 may initiate a purge when a user resets orotherwise indicates that filter 15 has been replaced. Once the requiredamount of water for purging water filter 15 has flowed through the waterdistribution system 16 and filter 15, controller 12 no longer causesuser interface 26 to signal that the water filter 15 needs to be purged.Alternately, user interface 26 may include a “purge water filter” inputfeature (e.g. a push button) that can be actuated by a user to purge anew water filter 15. Controller 12 may be configured to actuate pump 72and/or valve 74 to cause water to flow through a new water filter 15 fora predetermined period of time such that a predefined amount of waterflows through a new water filter 15.

Also, controller 12 may be configured to cause user interface 26 tocontinue signaling that a purge is required for a period of timefollowing installation of a new water filter if a user does not purgewater filter 15. For example, controller 12 may be configured to causeuser interface to display a “purge water filter” message and generate anaudio signal for a 14 day period of time following installation of a newwater filter 15 to thereby prompt a user to purge the water filter 15.If a user does not purge water filter 15 during the 14 day period,controller 12 may be configured to stop displaying a “purge waterfilter” signal on user interface 26, or the controller 12 may beconfigured to cause user interface 26 to only display the “purge waterfilter” signal at periodic intervals without an audio signal after the14 day period of time. It will be understood that 14 days is merely anexample of a possible time period, and other lengths of time may also beutilized.

Also, user interface 26 may be configured to display instructionsconcerning how to purge water filter 15. For example, user interface 26may provide an illuminated signal instructing a user to “push water padto purge filter” until the required amount of water has passed throughthe new water filter 15. Additional information concerning purging ofwater filter 15 may also be displayed by user interface 26.

Also, user interface 26 may include a user input feature (e.g. button30) that enables a user to signal controller 12 that a new water filter15 has been installed. In this case, the refrigerator 1 does notnecessarily include a sensor such as rocker switch 56 to indicate when anew water filter is installed. Controller 12 may be configured toinitiate purging of filter 15 upon receiving a signal from a button 30,or controller 12 may be configured to provide a user with furtherinstructions concerning the procedure for purging the new water filter15. For example, user interface 26 may provide an illuminated signal“push water pad to purge filter” as discussed above.

With further reference to FIGS. 3 and 4, a water filter 15A according toanother aspect of the present invention includes a cylindrical body 76that is received in a rotatable filter housing 78. Filter housing 78 isrotatably mounted to refrigerator structure 82 for rotation about anaxis or bearing structure 80 from a horizontal position “H” (FIG. 3) toan upright position “U.” During installation, water filter 15A ishorizontally shifted from a first position “A” to an installed position“B.” The water filter 15A and housing 78 are then rotated from thehorizontal position “H” to the upright position U.

With reference to FIG. 4, upon insertion of water filter 15A in filterhousing 78, the water filter 15A is fluidly connected to connectors 50Alocated at the bearing structure 80 to thereby fluidly connect the waterfilter 15A to fluid conduits 52A and 54A. The pivoting filter housing 78and connectors 50A may be constructed according to known designs, suchthat details of these features are not described in detail herein.

Referring again to FIG. 4, a sensor such as a rocker switch 56A isconfigured to provide a signal to controller 12A when a new water filter15A has been installed. Specifically, as a new water filter 15A isrotated from the horizontal position H to the upright position U (FIG.3), outer surface 64A of water filter 15A contacts ramped surface 66A ofrocker member 62A of rocker switch 56A to thereby actuate rocker switch56A and generate a signal to the controller 12A. The change of state ofrocker switch 56A is interpreted by controller 12A to mean that a newwater filter 15A has been installed. Rocker switch 56A may be mounted tostationary refrigerator structure 82.

The fluid conduits 52A and 54A are fluidly connected to an ice maker 20Aand/or a water dispenser 24A, and controller 12A controls the flow ofwater through the water circulation system 16A utilizing pump 72A and/orvalve 74A in substantially the same manner as described in more detailabove in connection with FIGS. 1 and 2. Controller 12A is operablyconnected to a user interface 26A, and user interface 26A may providevisual and/or audio information to a user in substantially the samemanner as described in more detail above in connection with a userinterface 26 (FIGS. 1 and 2) to thereby prompt a user to purge the waterfilter 15A. It will be understood that various other types of sensorsmay be utilized to detect the presence of a new water filter 15A, andthe rocker switch 56A is therefore merely an example of a preferredembodiment.

With further reference to FIGS. 5 and 6, a water filter 15B according toanother aspect of the present invention includes a cylindrical body 32Bthat may be substantially similar to the cylindrical body 32 of waterfilter 15 of FIG. 2. Water filter 15B is received in a filter housing36B, and includes connectors 48B that fluidly interconnect withconnectors 50B to thereby provide for flow of water through waterfiltration system 16B to an ice maker 2013 and/or water dispenser 24B.Flow of water though the water circulation system 16B may be controlledby a controller 1213 that is operably connected to a pump 72B and/or avalve 74B.

Water filter 15B includes a memory device 84 that is mounted in ashallow recess or cavity 86 formed by upstanding sidewalls 88 ofcylindrical body 32 of water filter 15B.

With reference to FIG. 6, filter body 32B of water filter 15B mayinclude standoffs or spacers 90 that retain memory device 84 in a spacedapart location relative to outer surface 92 of filter body 32B withincavity 86. Memory device 84 may be secured in place utilizing adhesivesor other suitable connecting arrangement. Memory device 84 may comprisea board 94 that is made of a substantially non-conductive material. Anelectronic integrated circuit memory unit or chip 96 may be disposed onlower surface 98 of board 94. Conductive material in the form of traces100 electrically interconnects the memory chip 96 to electrical contacts102. An electrical connector 104 includes a housing 108 that is securedto filter housing 36B. Electrical connector 104 also includes springloaded contacts 106 that are biased into contact with contacts 102 ofmemory device 84 when water filter 15B is fully installed in filterhousing 36B. An electrical line 110 operably interconnects theelectrical connector 104 to controller 12B. Thus, when water filter 15Bis fully installed in filter housing 36B, spring loaded contacts 106 arein electrical contact with contacts 102 of memory device 84, andcontroller 12B can therefore determine if a new water filter 15B hasbeen installed. Furthermore, controller 12B can communicate with thememory unit 96 to retrieve and/or store information. Contacts 106 mayalso be disposed on surfaces 66 or 66A of rocker switches 56 and 56A,respectively.

Memory unit 96 may be configured to store information concerning theamount of water that must flow through a specific water filter 15B toprovide for proper purging. Memory unit 96 may also store informationconcerning the allowable filter life (i.e. volume of water that may flowthrough filter 15B before filter 15B needs to be replaced). Memory unit96 may also store information concerning the manufacturing date of thefilter, filter installation date/time, and/or information concerning howlong the water filter 15B has been installed in a particularrefrigerator. Still further, memory unit 96 may be configured to storeinformation concerning the amount of water that has flowed through aparticular water filter 15B. For example, upon installation of waterfilter 15B, controller 12B may communicate with memory unit 96 to storeinformation in memory unit 96 concerning the amount of water that hasflowed through a particular water filter 15B.

Controller 12B may be configured to cause user interface 26B to displayinformation concerning the need to purge a new water filter 15B whencontroller 12B determines that a new water filter 156 has beeninstalled. The prompts and signals for purging water filter 15B may besubstantially similar to the arrangements described in more detail abovein connection with FIGS. 1 and 2.

In addition to the water filter purge prompts/alerts, controller 12B mayalso be configured to cause user interface 26B to display informationconcerning the filter life of a water filter 15B. For example, userinterface 26B may display the percentage of usable life of water filter15B that has been used and/or is remaining. This information couldcomprise a message, or it may comprise a graphical representation of theremaining water filter life. For example, if a water filter isconfigured to allow for one thousand gallons of water before requiring areplacement, user interface 26B could display a message such as “20% offilter life remaining” after 800 gallons of water have passed through aparticular water filter 15B. This provides a user with informationconcerning the remaining life of a water filter 15B. User interface 26Bmay also be configured to provide various alerts to a user when a waterfilter 15B needs to be replaced. For example, user interface 26B couldsimply display a signal “replace water filter” once the allowable amountof water has passed through a water filter 15B. A “replace water filter”signal may also be displayed if a water filter has been installed forthe maximum allowable period of time (e.g. two years). If the waterfilter 15B is not replaced despite the fact it has exceeded itsallowable life, user interface 26B may provide additional prompts toalert a user that the water filter 15B needs to be replaced. Forexample, the user interface 26B could provide a flashing light and/or anaudible signal concerning the past due water filter replacement.

It has been found that electrical contacts 102 and/or 106 tend tocorrode quickly if controller 12B is in constant communication withmemory chip 96. Thus, in a preferred embodiment, controller 12B isconfigured to communicate with memory chip 12B at specified timeintervals. For example, controller 12B may communicate with memory chip96 for a very brief interval, (e.g. several seconds or less) once every24 hours, or only when refrigerator doors 6 and/or 7 are opened, orother usage cues based on user interaction with the refrigerator. Suchusage cues may comprise actuation of ice and/or water dispensers 22 and24, respectively.

It will be understood that the memory device 84 could comprise otherdevices. For example, memory device 84 could comprise an RFID tag, andthe refrigerator may include an RFID reader that communicates with theREID tag.

It is also to be understood that variations and modifications can bemade on the aforementioned structures and methods without departing fromthe concepts of the present invention, and further it is to beunderstood that such concepts are intended to be covered by thefollowing claims unless these claims by their language expressly stateotherwise.

The invention claimed is:
 1. A refrigerator, comprising: an insulatedcabinet forming a refrigerated internal space; a powered refrigerationsystem providing controlled cooling of the refrigerated internal space;a water system configured to distribute water from an external source toa dispenser, the water system including at least one fluid conduit; areplaceable water filter unit detachably connected to the fluid conduitwhereby water flowing through the conduit is filtered by the waterfilter, wherein, upon initial installation of the water filter in therefrigerator, the filter can be purged by causing a necessary amount ofwater to flow through the water filter; a control feature that can beactuated by a user to cause water to flow through the water filter unit;and a user interface configured to prompt a user to actuate the controlfeature to purge the water filter by causing water to flow through thewater filter upon installation of a water filter.
 2. The refrigerator ofclaim 1, including: a controller that is operably connected to the userinterface; and a sensor that generates a signal that is utilized by thecontroller to determine if a water filter is installed.
 3. Therefrigerator of claim 2, wherein: the user interface comprises a lightsource.
 4. The refrigerator of claim 3, wherein: the controller causesthe user interface to illuminate in a predefined manner if thecontroller determines that a water filter has been installed to therebyprompt a user to purge the water filter.
 5. The refrigerator of claim 4,wherein: the controller determines an amount of water that has passedthrough a water filter after installation of a water filter to therebydetermine if a sufficient amount of water has passed through the filterto purge the water filter.
 6. The refrigerator of claim 5, wherein: thecontroller utilizes a predefined water flow rate and a measured lengthof time water has flowed through a water filter to determine an amountof water that has passed through a water filter.
 7. The refrigerator ofclaim 4, wherein: the user interface is illuminated for a predefinedperiod of time following installation of a water filter unless the newfilter has been purged.
 8. The refrigerator of claim 2, wherein: thedevice comprises a memory unit mounted on the replaceable water filter,wherein the memory unit communicates with the controller when the waterfilter is installed in the refrigerator, and wherein the memory unitstores information relating to at least one of an amount of water thathas passed through the water filter and an allowable amount of waterthat can pass through the water filter before replacement of the waterfilter is required.
 9. The refrigerator of claim 8, wherein: the memoryunit includes a first electrical contact arrangement, and therefrigerator includes a second electrical contact arrangement thatengages the first electrical contact arrangement when the water filteris installed and thereby electrically interconnects the controller tothe memory unit.
 10. The refrigerator of claim 9, wherein: the memoryunit comprises a board having a memory device and electrical conductorsdisposed on the board, the electrical connectors comprising a pluralityof first contacts; and the second electrical contact comprises aplurality of second contacts that are resiliently biased into contactwith the first contacts.
 11. The refrigerator of claim 10, wherein: thecontroller energizes the second contacts to communicate with the memorydevice only under predefined conditions, whereby, during operation ofthe refrigerator over a period of time comprising at least one week, thesecond contacts are energized for much less than fifty percent of theperiod of time.
 12. The refrigerator of claim 11, wherein: thepredefined condition comprises a time interval from a prior energizingof the second electrical contacts.
 13. The refrigerator of claim 2,wherein: The sensor comprises a rocker switch that moves to changestates as a water filter is installed in the refrigerator.
 14. Therefrigerator of claim 2, wherein: The sensor comprises a reed switchthat changes states when a water filter is installed in therefrigerator.
 15. A method of prompting a purge of a water filterfollowing installation of the water filter in a refrigeration unit ofthe type having a water circulation system including a replaceable waterfilter and a user interface capable of generating a signal to a user,the method comprising: providing a refrigerator with a sensor that iscapable of determining if a water filter has been installed in therefrigerator; and causing the user interface to generate a purge signalindicating that the water filter needs to be purged after installationof the new water filter.
 16. The method of claim 15, wherein: the userinterface includes a light source; and causing the light source toilluminate to thereby generate a purge signal indicating that the waterfilter needs to be purged.
 17. The method of claim 15, wherein: the userinterface is caused to generate a purge signal until a predefined amountof water has passed through the water filter following installation ofthe water filter in the refrigerator.
 18. The method of claim 17,wherein: the refrigerator includes a powered valve that opens to permitflow of water through the water filter; and including: determining awater flow rate through the water filter when the powered valve is open;measuring a length of time the powered valve has been open sinceinstallation of a water filter; calculating an amount of water that hasflowed through the water filter utilizing the water flow rate and thelength of time the powered valve has been open; and causing the userinterface to generate a signal indicating that the water filter needs tobe purged unless a predefined minimum amount of water has flowed throughthe water filter since the water filter was installed in therefrigerator.
 19. The method of claim 15, including: providing a waterfilter having a memory storage device; storing usage informationrelating to a volume of water that has passed through the water filter;accessing the usage information; and causing the user interface todisplay information relating to the usage information.
 20. Arefrigeration unit, comprising: an ice maker; a water circulation systemsupplying water to the ice maker; a removable water filter detachablyconnected to the water circulation system; a sensor configured todetermine if a water filter is connected to the water circulationsystem; and upon installation of a water filter, the ice maker isconfigured to operate in a purge mode to remove air from the watercirculation system until water reaches the ice maker, the ice makerswitching to a standard mode to make ice according to predefinedoperating criteria after water reaches the ice maker.